fix(spelling): correct selectFilter typo across templates and localization files (#3886)

# Description of Changes

- **What was changed**  
- Renamed all occurrences of the misspelled key `selectFillter` to
`selectFilter` in HTML templates (`team-details.html`,
`adminSettings.html`, `cert-sign.html`) and in every locale properties
file under `stirling-pdf/src/main/resources/messages_*.properties`.
- Removed obsolete `WorkInProgess` entries from various locale files.

- **Why the change was made**  
To fix a consistent spelling mistake in the UI select placeholder key,
ensuring that the label displays correctly and translations resolve
properly.

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

proprietary/src/main/resources/templates/accounts/team-details.html

@@ -168,7 +168,7 @@
             <div class="data-form-group">
               <label for="userId" class="data-form-label" th:text="#{team.selectUser}">Select User</label>
               <select name="userId" id="userId" class="data-form-control" required onchange="checkUserTeam(this.value)">
-                <option value="" disabled selected th:text="#{selectFillter}">-- Select User --</option>
+                <option value="" disabled selected th:text="#{selectFilter}">-- Select User --</option>
                 <option th:each="user : ${availableUsers}" th:value="${user.id}" th:text="${user.username}"
                   th:data-team="${user.team != null ? user.team.name : ''}"
                   th:data-team-id="${user.team != null ? user.team.id : ''}">